Further, if I want a point to be an object containing fields for "x" and "y", I'd much rather just use a dict rather than construct an object in some incompatible inheritance nightmare.
This is a ridiculous example, because dataclasses and protocols are orthogonal: dataclasses (help) define data structures, while protocols define behaviour.
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That’s what Protocols are for
They don't work in the way you would think for dataclasses or at all for dicts/TypedDicts.
See this for dataclasses: https://github.com/python/mypy/issues/5374#issuecomment-8841....
This is a ridiculous example, because dataclasses and protocols are orthogonal: dataclasses (help) define data structures, while protocols define behaviour.